<TITLE>perror</TITLE>
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<h3>PERROR(3)               Library functions               PERROR(3)
</h3>

<h3>NAME
</h3>       perror - print a system error message

<h3>SYNOPSIS
</h3>       #include &lt;stdio.h&gt;

       void perror(const char *s);

<h3>DESCRIPTION
</h3>       perror  produces  a  message on the standard error output,
       describing the last error encountered during a call  to  a
       system  or  library  function.   The  argument string s is
       printed first, then a colon and a blank, then the  message
       and  a  new-line.   To be of most use, the argument string
       should include the name of the program that  incurred  the
       error.   The error number is taken from the external vari-
       able errno, which is set when errors occur but not cleared
       when non-erroneous calls are made.

<h3>CONFORMING TO
</h3>       ANSI C, POSIX

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<h3>SEE ALSO
</h3><p>
<a href=errno.htm>errno</a>, 
<a href=strerror.htm>strerror</a>, 
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                          March 16, 1995                        1


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